How often do you get to pick the brains of a Nobel Prize winner?
Today we're going to explore the universe with a man who's day job has him chasing gamma ray bursts and supernovae.
Professor Brian Schmidt is an astronomer and research fellow at the Australian National University.
Last year Brian and his collaborators were awarded the Nobel Prize for Physics, a tremendous honour and a testament to the significance of their research.
Brian and his fellow researchers have been able to show that the universe is expanding at an accelerating rate.
It's fascinating stuff - you can listen to Brian's story here or or subscribe to our podcast. Just search for "The Guestroom" in ITunes or Juice, or head to our program page.